This procedure allows you to restore your existing settings or the default settings if necessary.
Download
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Run TCPOptimizer, accepting any security warnings (trust me this operation is 100% safe)!
Drag the slider to the maximum capable speed of your connection.
Select the Network Adapter which connects to your BB connection (ask if you need to)!
Select the Optimal settings button at the bottom of the window.
Click apply changes.
Ensure Backup is ticked.
Click OK.
Reboot to apply changes.
Run a speed test then come back and thank me!
An update on this post the default MTU setting that TCPOptimizer set for the MTU on Optimal settings is 1500 and this may well be far to big for most people so once you run Optimal settings go to the tab bar and select Largest MTU Tab and run that and you will get the correct MTU for your connection see image bellow.
Once you have the recommend MTU go back to the General Settings Tab and change the 1500 to ???? click on apply and reboot the PC. Remember to also change the MTU settings in the router [WAN Setup > MTU Size (in bytes)]to the same ones as ones that you set in TCPOptimizer